Wellsite Geologists Job Description
• WSG is to provide the work assigned to him in any job location assigned by Halliburton. This would include the below in General:
• shall supply an accurate daily geologic report to the customer’s Representative. The daily geological report shall include
• Drilling activities
• Encountered lithology
• Description of any hydrocarbon shows
• Assignment of stratigraphic formation tops or key markers.
• Prognosis of the next day`s drilling activities
• shall perform a quality check of wire line and LWD logging, mud logging and coring services are been conducted at well site.
Wireline and LWD logging
• Log runs correctly tied on depth.
• Depth match between logging services and driller.
• Calibrations of tools valid.
• Tool responses within acceptable ranges.
• Repeat section repeating accurately.
• Down time as a result of tool problems.
• Equipment functioning as designed and intend.
• Cuttings lag determinations.
• Consistency with offsetting wells.
Conventional and sidewall coring
• Core cut and core recovered; sidewalls shot and recovered.
• Core handled during all operations in a way to minimize damage.
• Core preserved as intended in coring program
Coordination of Geologic Services during Key Drilling Activities
• shall be responsible for coordinating geological services during key drilling activities
Activities during routine drilling operations
• Ensure that the primary well data, elevations and locations coordinates used in all well report and records are in agreement with the original surveyor`s report.
• Confirm the directional drilling targets as plan with Customer`s Drilling Supervisor and directional driller at inception of the well and at each crew change. The plan shall not be considered official until it is confirmed by the Wellsite Geologist
• Track progress of well pilot and horizontal by plotting directional surveys in Excel and/or other geological monitoring software, and maintain a log of all changes to the directional program.
• Provide the directional driller with target changes that reflect the
• Geology encountered while drilling, within tolerance determined prior to drilling.
• Maintain a pressure profile plot, and evaluate overpressure indicators and pressure interpretations. Immediately advice Customer`s Drilling Supervisor of any significant change.
• Coordinate with Customer`s Representative at all times regarding possible program revisions including sidetracks and provide both assistance and guidance to Customer`s Drilling Supervisor and the directional driller in designing any sidetracks or revision to the planned well paths in order to reach the well objectives efficiently.
• Ensure that the directional drilling survey information and reports are correct.
• Immediately advise Customer`s Drilling Supervisor of any significant lithology change, or other geological parameter, which might affect the safe and efficient drilling of the well, or effect target trajectories. Maintain a spreadsheet of the mud properties and the mud resistivity while drilling a well.
• Obtain and process drill cuttings at an interval and in a manner specified by Customer when there is shortage of personal in rig site. Lithological description of drill-cuttings, fluoroscopic examination for hydrocarbon determination, and the estimation of cuttings gas and visual porosity.
• Use all available wellsite information to compare projected casing points, logging points, coring points and well TDs to the well plan, and suggest modifications as necessary to reach the well`s objectives to Company`s Geology and Drilling representatives.
Witnessing of coring and logging operation
• Report a brief core description including lithology and shows.
• Coordinate selection of sidewall and MDT depths with the Company`s Representative and communicate the same to Customer`s Wireline contractor field representative.
• Witness MDT pressure measurements.
• Produce a wireline logging report which includes but is not limited to log runs, dates, times, intervals, temperature log quality comments and time delays in the daily geological report.
• Calculate reservoir properties (including saturation and net pay) for primary and secondary objectives using Wireline; log data.
• When MDT fluid samples are obtained, witness as the tool sample chamber is filled
Modifications to lateral sections during drilling
• Monitor all wellsite geologic services to obtain an accurate and timely geologic cross section of the borehole path.
• Coordinate geosteering efforts at the wellsite, making modifications as necessary to maintain position within the target zone, within tolerances established by Customer prior to drilling the lateral.
• Report to Customer`s Representative any deviations beyond the established tolerances between the actual/forecasted and expected stratigraphy along lateral section.
• Monitor drilling activities and report to Customer`s Representative when discrepancies occur between planned and actual stratigraphic marker depths.
• Witness DSTs and report results to Customer`s Representative. Report to the Customer`s Representative any usual event such as unexpected shows or abrupt geologic deviations from the plan. Maintain a secure working file at the wellsite for all geological data, logs and communications, and back up all Oxy Oman Blocks the mainframe servers on a periodic schedule.
• Report in person to Customer`s office on request for briefing / debriefing, or transport of confidential data.
• Report unsatisfactory performance of Company mud logging or wireline logging contractors to the Customer`s Representative.
• Transmit all digital data received in the field (including preliminary mud log, LWD and wireline logging data) to the Customer`s Representative.
• Producing a WINLOG composite log for all pilot and exploratory holes.
Final well report
• shall assess information from Customer and it`s contractors, as and when required, and shall prepare a final well report that include the following:
• Well summary data sheet.
• Drilling summary chart.
• Well summary, including discussion of reservoir quality of target zones.
• Regional setting.
• Well objectives.
• Geology summary, including discussions on stratigraphy, lithology,
• logging runs, cores, pressures and temperatures.
• Geophysical summary including VSP or other surveys obtained.
• Hydrocarbon indications, including mud log shows, MDT samples, conventional cores and sidewalls, and petrophysical summary. Drilling summary including drilling history, hole problems, well design, well trajectory, and formation pressure data.
• Attachments including a pre-drilling and post-drilling maps and cross sections, and deviation survey.
• Summary of well outcome.
• Lessons learned